Use the phylogeny showed below to answer questions 21 24 Us

Use the phylogeny showed below to answer questions 21 - 24. Using the phylogeny shown, state a shared ancestral character for the tetrapod\'s (Amphibia. Reptilian, and Mammalia) Using the phylogeny shown, which of the following is an accurate statement Activiti is more closely related to Dipnoid than it is to Amphibia actionist is related to Dipnoid, but not to Actinopterygii Activiti is more closely related to Dipnoid than it is to Actinopterygii actionist is equally related to Dipnoid and Actinopterygii Using the phylogeny shown, which of the following is an accurate statement of relationships Myxine is more closely related to Petromyzontid than to Dipnoid Myxine is equally related to Petromyzontid and Dipnoid Myxine is more closely related to Dipnoid than to Petromyzontid Myxine is related to Petromyzontid, but not to Dipnoid State the letter of the dot on the tree (A - K) that corresponds to the most recent common ancestor of Dipnoid and Chondrocytes.

Solution

21. A shared ancestral character for tetrapods from the chart is legs. From the diagram legs are common for all 3 whereas amniotic egg is common for reptilia and mammals. It is understood by how the lines of the phylogeny chart bifurcate.

22. option a would be the correct statement. Its because actinistia and dipnoi are both having lobed fins whereas amphibia have legs. Actinistiia is not closely related to actinoptergii because actinoptergii does not have lobed fins. Other than that they have some things in common like head,vertebra etc. Compared to that actinistia and dipnoi have more in common.

23. Option a is accurate. Myxini is more closely related to petromyzontida than to dipnoi. They have notochord, head etc in common. Petromyzontida is a better descendant to myxini as it has vertebral column too. But then too its closely related to myxini when compared to dipnoi which has several other features not seen in myxini like jaws,lungs,lobed fins etc.

24. the letter would be F. That is the most recent common ancestor of chondrichthyes and dipnoi. Both have jaws and mineralized skeleton in common.